State Management :: How To Save CheckBoxList Values Into The Viewstate

Dec 16, 2010

how to save the CheckBoxList values into the viewstate

for e.g.i've a CheckBoxList with 4 ListItems,

if I check 1 & 3 items, then I close the page

if I re-open the page, items 1 & 3 must be checked.

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State Management :: ViewState And ObjectDataSource / Getting Values From Viewstate In GetTopThemes?

Jan 11, 2011

I have problem getting values from viewstate in GetTopThemes.





when the page is not Posted back, I saved all values in the viewstate.

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State Management :: Save An ImageButton To The Viewstate?

Sep 8, 2010

I have created a custom control that extends the class ImageButton, the thing is that I now also want to save this control to a viewstate.

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State Management :: How To Save Int Array In Viewstate

Oct 25, 2010

how save int array in viewstate?

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State Management :: How To Save An Object Reference In A Viewstate

Nov 17, 2010

When I try to save an object reference in a view state it tries to save the object content using serialisation. to save the object reference only to apply to this object instance after postback?

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State Management :: Save The Viewstate At The Server Side Instead Of __VIEWSTATE Hidden Field?

Feb 10, 2011

i am facing the following problem while saving the viewstate on the server side using the savepagestatetopersistencemedium, but this is not working for the pages which contains update panel.

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State Management :: Store Viewstate Values In Another Methods?

Apr 14, 2010

In my website the page viewstate values in hidden are very large.So i wish to store this values into another methods(session,files etc).so please advice me to some methods..

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State Management :: Failed To Load Viewstate. The Control Tree Into Which Viewstate Is Being Loaded Must Match ?

Oct 9, 2010

Now here is the weird thing. First i am running it locally on the built in vs2008 web server.I load my control in fine, do a postback from a linkbutton, locally on my machine it all works fine, no issue.However when it goes onto my host, it falls over with the message:

Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request.Now i also load controls dynamically and use postbacks and things in the admin area of the site...and that works fine, however my front end just keeps failing? See the code behing below:


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State Management :: ViewState - Does The Master Page Have Its Viewstate

Apr 30, 2010

I have been getting this error a lot lately with some of my users, and I had a couple of concerns with view state and I have read so many articles but I am still lost..

1. I use masterpage on all the pages and I need viewstate for some of the pages but..

There is a page where a user will fill out the information and then submit this data to a cgi server, and it is where I get most of the Client Disconnected errors, what would happen if I disable viewstate when they click on that button?

Now when a user browses from one page to another, does the view state from the previous page get deleted? If not how would I delete it?

Does the master page have its own viewstate? Would I be able to make sure none of items on my master page are using the viewstate?

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State Management :: How To Custom Controls And ViewState Management

Aug 24, 2010

I want to know that when we create custom controls, then is there State Management through ViewState done automatically or we have to handle it explicitely ?Since i have created Custom Controls that is behaving as if it is not maintaining its state on PostBack.

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Web Forms :: CheckBoxList - Save Values To SQL

Sep 15, 2010

I have a checkboxlist on a c# page where when a box is checked it saves its value in the following format to a textbox

1,2,3, etc...


This works ok however the problem is i want to be able to audit the values i save in the DB. For example i may want to do a count how many times 1 appears or 2 etc..

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State Management :: Bug In .NET ViewState

May 20, 2010

I start with a blank ASP.NET page where I disable ViewState for the whole page with EnableViewState=False and even ViewStateMode=Disabled.keep adding various controls to the page -- Label, Table, Calendar, TextBox, DropDownList.Everything looks good, i.e. my __VIEWSTATE tag fluctuates between 24 and 28 characters.As soon as I add a single RadioButton (or CheckBox), the __VIEWSTATE shoots up to 130 characters. And it keeps growing by over 100 characters every time I add another RadioButton.

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State Management :: Set A Certain Viewstate To Nothing?

Apr 19, 2010

I have a code like this in the Me.LoadComplete event.


Now I would like to set this viewstate("data") = nothing on a certain button click in a user control (.ascx) in this page but it doesnt clear the viewstate. What am I doing wrong? In the onClick even of the button in the .ascx I write Me.viewstate("data") = Nothing

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State Management :: Set Select On Checkboxes In Dynamic Checkboxlist?

Aug 5, 2010

I have a code below...that dynamically create a checkboxlist.....

....connection code....
Dim da As New SqlDataAdapter(myDBCommand)[code]....

Ok so that works coming from the database populating the checkboxlist...:)when the user click on some values...I want them to go to another page.....ok I have all the values they going to another page.....but what I want to do is when they come back to the page where this Dynamic checkboxlist is on...I want to select all the checkboxes they selected. ...before they went to this other how can I dynamically select certain checkboxes from the dynamic checkbox....? the values will be stored in a querystring...not a how can I use the querystring value and re select the checkbox corrisponding to the querystring value?

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State Management :: Viewstate / Use Textbox Value?

Jul 22, 2010

I want to use textbox value after I visit from current to other page then again to current page using viewstate but value should be the one when I was current page last time.

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State Management :: ViewState Value Set After 2nd Postback?

May 3, 2010

I am creating a simple string of values that get added to a label after a post back. I am setting the values thorugh ViewState. However, my appended values do not get updated until AFTER the 2nd postback. Example:

On Page_Load the label displays a "0";

If I enter a "1" in the text box and click the button the label still displays a "0";

If I click the button again (the 2nd postback) then my label correctly displays "0,1"; This works for whatever value I enter after. i.e. "0,1,35,hello world", etc.

What I am I missing? Code Below.

.ascx - I left out inherits and codebehind


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State Management :: Pop Up Change Viewstate?

Dec 22, 2010

have some viewstate value in my opener window ,when i close the popup i want to set new value in the opener viewstate.

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State Management :: Viewstate Size Too Heavy (Around 2MB)

Sep 16, 2010

I am developing a a web application of a general store where the operator has to enter the things what customer has purchased. Like daily usage item,or anything. So I have form in which I first ask how much item u wannt to register...(if he has 20-30 number of items then operator will enter 20-30 then in gridview 20-30 item are opened. With bind dropdownbox containing name of item ,then textboxs containing mrp, value, stock avail of that item. Here is the link for demo. [URL]. Problem is suppose the operator enter the value above 20, then viewstate size id about 1.50Mb that's too heavy.

Here is .cs code

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State Management :: How To Convert Viewstate To List

Jan 31, 2011

I stored a list<mytype> object in a viewstate. Type of list<mytype> comes from a public structure which is defined at page.

When I try to convert viewstate to a list<mytype> object it cause error.

Public struct mytype
{ list<mytype> obj = new list<mytype>();
list<mytype> tempobj = new list<mytype>();
tempobj = (list<mytype>)viewstate["mystate"];// this line cause error !

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State Management :: How To Store List In ViewState

May 27, 2010

I want to store List<Class> object to ViewState, when i try to do this than its giving me error to make class serialize,but my class is partial class so didn't get serialize keyword on class how can i store List object to viewstate.

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State Management :: How To Store IQueryable Value In ViewState

Jan 3, 2011

i want to store IQueryable value to ViewState. my code is as below:

Property _Query()
As IQueryable
CType(ViewState("_Query"), IQueryable)
Set(ByVal value
As IQueryable)
ViewState("_Query") = value

but when i run my page i get following error:

Type 'System.Data.Linq.DataQuery`1[[DynamicQueries.VW_EmployeeProfile_Filter, DynamicQueries, ersion=, Culture=neutral, PublicKeyToken=null]]' in Assembly 'System.Data.Linq, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable

what should i do to get rid of this error. previously i was doing like this:

Private Shared _Query As IQueryable

but problem is that in Multi users environament, Shared variable is making problem, that is why i want to store it in ViewState.

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State Management :: How To Prevent Extracting Viewstate

Feb 28, 2011

As you know viewstate can recognize as a vulnarable item if we do not encrype it I know how to encrype the viewstate that I define in a web page but my problem start from here I downloaded a software which help you to exract the unencrypted viewstate of every website the link of that software is as follow:


but when I make even empty page without viewstate ,this program can extract the viewstae of my page but if check some website like google ,yahoo,amazoon

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State Management :: Out Of Control ViewState Cause Disk I/O?

Jun 4, 2010

I have an application that I am working on. We are experiencing odd outages daily. The outages actually bring down the Virtual Servers (web farm of 4 VMs). The last odd metric before VM becomes inaccessible is that disk I/O is at 100%. While discussing this with the client, an idea was thrown out that I wouldn't have considered because I have never heard of such a thing. The idea was that our immense ViewState (yes I will be working on reducing that in the next release) overwhelmed the server or something and the server needed to start writing the ViewState to a file in a temporary folder somewhere. The thought was that when the server started to get overwhelmed, it would have to queue requests and would run out of memory and need to start using disk.

My application is poorly written and the viewstate is completely overused. However, it works 23+ hours of the day including through peak times without problems. But I have never heard of IIS or ASP.NET writing information to files on the server while queueing requests. I had no answer for this seemingly outrageous theory. Can anyone confirm for me that this is not how ASP.NET (2.0) or IIS are written?

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State Management :: Validation Of Viewstate MAC Failed?

Dec 29, 2010

In our control environment, we've started, somewhat intermittently, getting:

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

on our website.It also suggests:

Source Error: The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

<%@ Page Language="C#" Debug="true" %> or:

2) Add the following section to the configuration file of your application:

<compilation debug="true"/>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

We already have compilation debug as true. We have upgraded our website to ASP.NET 4.0, although our middle tier components are still at 3.5. As we do in out production machine configs (which are using ASP.NET 3.5) we have

<section type="System.Web.Configuration.MachineKeySection, System.Web, Version=, Culture=neutral, PublicKeyToken=abcabc123123" allowDefinition="MachineToApplication"/>

we also have one in the new .NET 4.0 machine.config:

<section type="System.Web.Configuration.MachineKeySection, System.Web, Version=, Culture=neutral, PublicKeyToken=abcabc123123" allowDefinition="MachineToApplication" />

This control environment is not in a server farm. Why is it suggesting that I turn on debug, when it's already on. Why isn't it showing me my source code?

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State Management :: Validation Of Viewstate MAC Failed ...?

Mar 1, 2011

I have this error:

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

my website was designed using dotnet 2003 worked under dotnet framework 1.0 the website was working fine then i had to upgrade the server to windows 2008 iis 7.0 so i configured the website to work under dotnet frame work 2.0 and the problem started to show up

i have tried many

enableViewStateMac="false" viewStateEncryptionMode="Never" enableEventValidation="false"
<machineKey validationKey="AutoGenerate,IsolateApps" validation="SHA1" decryption="Auto" decryptionKey="AutoGenerate,IsolateApps" />

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